Orthodontia, or, Malposition of the human teeth : its prevention and remedy / by S.H. Guilford.

  • Guilford, Simeon Hayden, 1841-1919.
Date:
1893
Catalogue details

Licence: Public Domain Mark

Credit: Orthodontia, or, Malposition of the human teeth : its prevention and remedy / by S.H. Guilford. Source: Wellcome Collection.

Provider: This material has been provided by The University of Glasgow Library. The original may be consulted at The University of Glasgow Library.

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    generated by the action of the acid solution upon the zinc plates passes through the positive (+) wire to the rod d into the plating solution by way of the anode (/), across to the cathode (e) and back to the battery by way of the negative wire (-). The current in its passage decomposes a portion of the gilding solution and causes the metal thus set free to be attracted to and deposited upon the article to be plated. The solution being thus deprived of a portion of its con- stituent salt, in turns acts upon the suspended anode and takes from it a sufficiency*of the metal to restore its former equilibrium. In this way, as each article is coated with the metal, the suspended anode is eaten away to replace the loss and the solution suffers no great diminution of strength. The anode for copper plating consists of a piece of sheet copper, while for gilding, the anode should be of pure gold and can be made by melting gold foil scraps into a button and then hammering it into a thin sheet. All anodes should have perfectly clean surfaces in order that they may be readily acted upon. PLATING. With the battery in position and the jars filled to within about two inches of their tops with their respective liquids, the operation of plating is a very simple one. After the article to be plated has been made smooth and polished and properly cleansed in the cleansing solution, it is rinsed in water, and if other than steel, is immediately suspended in the plating solution from the copper rod c, The corres- ponding anode is hung upon the other rod d, when the deposit of metal at once begins. The length of time necessary to secure a good coating will vary somewhat with the strength of the solution, the intensity of the current and the metal to be plated. Usually from ten to twenty minutes will be sufficient, but a little practice will be neces- sary to determine the time and secure the best results. If